DLM sets 99% of lines to a 4 meg sync and then slowly increases this. Others start slightly higher and are then increased...
This means that when you first connect on a good line you may have an SNR of over 20db
Then as the speed is slowly increased the SNR will fall.
On a good line at the end of the 10 days the customer will see the initial slow sync and high noise margin turn into a high sync and a low noise margin.
At the end of the 10 days the speed is capped and you are unable to ever sync above this unless DLM makes further changes or Sky do.
If you were getting a 5 meg sync with an SNR of 25db with 1 router
& a 5 meg sync with an SNR of 6db with another router
The 1st router would be the better performer as there is an extra 19db noise margin between the two. This means the 1st router would sync far higher at 6db noise margin
Obviously differences in SNR are usually not this big.
So YES a low SNR is good after DLM as it means your line can support it without being unstable.
BUT a high SNR means there is plenty of space for an increase in speed.
Considering that during DLM the sync is quite low initially, a high SNR is good as it means you can get plenty of extra speed over the following 10 day training period.
Just to add every time you turn the router off and back on in a short space of time DLM assumes the lines couldn't handle the speed it was connected at. It falsely believes that the line dropped connection due to interference or instability and hence reduces your speed.
All in all you should have waited for 10 days with the Sky provided router but it'll prob be fine.
EDIT: I think the sky router may have yielded a faster final sync as you say it had an higher SNR & when you plugged your own router in the SNR immediately fell.
Edited by ukhardy07 (Sun 07-Aug-11 18:48:10)